I've read the SGS II is coming out in the month of August. I am not a big fan of Samsung, but I admit I really do like that phone. There is a reason it is the best-selling Android phone and sold 5M in 85 days.
I know some people don't like plastic because it sounds "cheap" and it feels light which makes it seem as heavy as a toy. But polymer plastic can be strong and helps with better reception. Doesn't have the shielding effect like metal.
If you are a fan of RAW POWER and fast web browsing. get the SGSII instead. I say it can hold its own vs the iPhone 5 in specs. And if the iPhone 5 does come out swinging, the Nexus Prime at quad core could be looming. And HTC Vigor is already coming out with a 720p display resolution and run at 1.5GHz dual core. But SGSII is future-proof for a couple years at least.
Stupid to get last year's model. If you want to save money, forget the S and get a Nexus One for $260 at Amazon. The difference between N1 and NS is incremental. The N1 has better build quality and design at least. Not a fingerprint magnet on the back either.